Hydrogen combines with chlorine to form HC. It also combines with sodium to form `NaH`. IF sodium and chlorine also combine with each other, they will do so in the ratio of their mass as :-

Options

A. `23:35.5`
B. `35.5:23`
C. `1:1`
D. `23:1`

Explanation

To determine the mass ratio of sodium (Na) and chlorine (Cl) when they combine to form sodium chloride (NaCl), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Molar Masses**:
- The molar mass of sodium (Na) is 23 g/mol.
- The molar mass of chlorine (Cl) is 35.5 g/mol.

2. **Write the Chemical Formula**:
- Sodium combines with chlorine to form sodium chloride (NaCl).

3. **Determine the Mass Ratio**:
- In sodium chloride (NaCl), the ratio of sodium to chlorine by mass can be calculated as follows:
\[ \text{Mass ratio of Na to Cl} = \frac{\text{mass of Na}}{\text{mass of Cl}} = \frac{23 \text{ g}}{35.5 \text{ g}} \]

4. **Calculate the Ratio**:
- To simplify the ratio, we can divide both numbers by the mass of sodium:
\[ \text{Mass ratio} = \frac{23}{35.5} \approx 0.646 \]
- This can also be expressed as a ratio of whole numbers. To find a simpler ratio, we can multiply both sides by 100 to avoid decimals:
\[ \text{Mass ratio} = \frac{23 \times 100}{35.5 \times 100} = \frac{2300}{3550} \]
- Simplifying this gives us a ratio of approximately 23:35.5.

5. **Final Ratio**:
- The final mass ratio of sodium to chlorine in sodium chloride (NaCl) is approximately:
\[ \text{Mass ratio of Na to Cl} = 23:35.5 \]

### Conclusion:
Thus, when sodium and chlorine combine, they do so in the mass ratio of **23:35.5**.